CN104772346A - Method for reducing tensile strength of steel hot-rolled wire rod for flexible copper-clad steel wire - Google Patents
Method for reducing tensile strength of steel hot-rolled wire rod for flexible copper-clad steel wire Download PDFInfo
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- CN104772346A CN104772346A CN201510161148.8A CN201510161148A CN104772346A CN 104772346 A CN104772346 A CN 104772346A CN 201510161148 A CN201510161148 A CN 201510161148A CN 104772346 A CN104772346 A CN 104772346A
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- tensile strength
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- control
- wire rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
- B21B1/18—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section in a continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/46—Roll speed or drive motor control
Abstract
The invention discloses a method for reducing tensile strength of a steel hot-rolled wire rod for a flexible copper-clad steel wire, and belongs to the technical field of steel rolling. A high-temperature rolling control process and a slow-cooling control process for a capped thermal insulation cover at ultralow roller speed are adopted. The control measures for the main rolling process and the slow-cooling process are as follows: a finish rolling temperature is stably controlled to be higher than 940 DEG C with a range from 940 DEG C to 980 DEG C; a spinning temperature is stably controlled to be higher than 940 DEG C with a range from 940 DEG C to 970 DEG C; in the capped thermal insulation cover control process at the roller speed of 0.18m/s, a fan is closed in stages and the thermal insulation cover is started in stages. The method has the advantage that the tensile strength of the steel hot-rolled wire rod for the flexible copper-clad steel wire is reduced to be not higher than 320 MPa from 360MPa though rolling control and slow-cooling control, the ferrite grain size level is reduced to be not higher than level 6.5 from level 8, and the application in industrial production is stable.
Description
Technical field
The invention belongs to technical field of steel rolling, in particular, provide a kind of method reducing soft state welding wire steel gren rod tensile strength.
Background technology
Soft state welding wire is mainly used in the fields such as data communication, electronic information industry and electronic devices and components, and end product has strict requirement to the electric conductivity of soft state welding wire product, drawing property, twisting property, mechanical property and welding performance.For mechanical property, require that specification will be not more than 340MPa in the tensile strength of the soft state welding wire product of ￠ 1.0mm-2.0mm scope, percentage elongation will be not less than 10%; Specification will be not more than 330MPa in the tensile strength of the soft state welding wire product of below ￠ 1.0mm, and percentage elongation will be not less than 3%.Soft state welding wire Product processing manufacturing enterprise ensures that its product reaches the performance indications requirement of downstream user, concrete performance indications requirement is proposed to the raw material steel gren rod of processing soft state welding wire, gren rod tensile strength will be not more than 320MPa, percentage elongation will be not less than 25%, and the contraction percentage of area will be not less than 70%.Simultaneously for ensureing that the soft state welding wire product performance index of the following specification of ￠ 1.0mm reaches requirement, one annealing treating process be increased.
Rolling mill practice major control three aspects of conventional strand variety steel, first aspect is the control to the operation of rolling each section of process temperature; Second aspect is the control to mill speed and dimensional accuracy; The third aspect is the control to cooling velocity and retarded cooling process.For the wire product having particular/special requirement, carrying out innovating and groping on the basis of conventional strand variety steel rolling mill practice, formulating the rolling mill practice control program made new advances, to reaching the Special use requirement of user.
For the reduction of soft state welding wire steel gren rod tensile strength, what take is exactly new rolling mill practice control program, is different from the roll control technique of conventional strand variety steel.First, what take is high temperature rolling process control schemes, and ensure that final rolling temperature stability contorting is more than 940 DEG C, scope is at 940-980 DEG C; Laying temperature stability contorting is more than 940 DEG C, and scope is at 940-970 DEG C; In retarded cooling process control, take ultralow roller speed and the slow cooling Controlling Technology of adding a cover stay-warm case, the grain size of organizing that effectively can control soft state welding wire steel gren rod is not more than 6.5 grades, organizes grain size number much smaller than conventional strand variety steel gren rod.Adopt above-mentioned innovation rolling mill practice control program, by scene, effective execution of this process program and capacity of equipment are ensured, the tensile strength stability contorting of soft state welding wire steel gren rod can be not more than 320MPa, meet the Special use requirement of user.
Summary of the invention
The object of the present invention is to provide a kind of method reducing soft state welding wire steel gren rod tensile strength, be applied in applicable processing soft state welding wire steel gren rod Rolling Production aspect, this technology is applicable to the fields such as online, bar and promotes.
The present invention takes high temperature rolling Controlling Technology, ultralow roller speed and the slow cooling Controlling Technology of adding a cover stay-warm case, and the technical parameter of processing step and control is:
A. final rolling temperature stability contorting is more than 940 DEG C, and scope is at 940-980 DEG C;
B. laying temperature stability contorting is more than 940 DEG C, and scope is at 940-970 DEG C;
C.0.18m/s ultralow roller speed and the slow cooling Controlling Technology of adding a cover stay-warm case, 1-6# blower fan cuts out, and 7-11# blower fan is opened, aperture 30-100%; 2-10 section stay-warm case is closed, 1 section and the unlatching of 11-13 section stay-warm case, ensures that wire rod cooling rate controls stable.
By roll control technique and the slow cooling Controlling Technology of this invention, the tensile strength of soft state welding wire steel gren rod is reduced to by 360MPa and is not more than 320MPa, ferrite grain size rank is reduced to by 8 grades and is not more than 6.5 grades, obtain stable application in the industrial production, Be very effective, product approve by downstream user.
Detailed description of the invention
The present invention can apply when high-speed wire factory produces soft state welding wire steel gren rod.
Adopt high temperature rolling Controlling Technology of the present invention and ultralow roller speed and add a cover the slow cooling Controlling Technology of stay-warm case, the Rolling Production of soft state welding wire steel gren rod is carried out in certain large-scale wire production factory, the gren rod tensile strength produced can be stable control be not more than 320MPa, ferritic structure grain size number is 6 grades, can meet the processing instructions for use of soft state welding wire high-end user.
The rolling mill practice taked and slow cooling Countermeasures are:
A. final rolling temperature stability contorting is at 960 DEG C;
B. laying temperature stability contorting is at 960 DEG C;
C.0.18m/s ultralow roller speed and the slow cooling Controlling Technology of adding a cover stay-warm case, 1-6# blower fan cuts out, and 7-11# blower fan is opened, aperture 30-100%; 2-10 section stay-warm case is closed, 1 section and the unlatching of 11-13 section stay-warm case, ensures that wire rod cooling rate controls stable.
Subordinate list explanation
Table 1 is tensile strength and the ferritic structure grain size number of soft state welding wire steel gren rod.
Table 1
| Steel grade | Sample number | Tensile strength Rm/MPa | Ferritic structure grain size/level |
| RTTB | 1 | 310 | 6 |
| RTTB | 2 | 316 | 6.5 |
| RTTB | 3 | 305 | 6 |
| RTTB | 4 | 300 | 5.5 |
Claims (1)
1. reduce a method for soft state welding wire steel gren rod tensile strength, it is characterized in that, the technical parameter of processing step and control is:
A. final rolling temperature stability contorting is at 940-980 DEG C;
B. laying temperature stability contorting is at 940-970 DEG C;
C.0.18m/s ultralow roller speed and the slow cooling Controlling Technology of adding a cover stay-warm case, 1-6# blower fan cuts out, and 7-11# blower fan is opened, aperture 30-100%; 2-10 section stay-warm case is closed, 1 section and the unlatching of 11-13 section stay-warm case, ensures that wire rod cooling rate controls stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510161148.8A CN104772346B (en) | 2015-04-07 | 2015-04-07 | A kind of method reducing soft state welding wire steel gren rod tensile strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510161148.8A CN104772346B (en) | 2015-04-07 | 2015-04-07 | A kind of method reducing soft state welding wire steel gren rod tensile strength |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104772346A true CN104772346A (en) | 2015-07-15 |
| CN104772346B CN104772346B (en) | 2017-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510161148.8A Active CN104772346B (en) | 2015-04-07 | 2015-04-07 | A kind of method reducing soft state welding wire steel gren rod tensile strength |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857254A (en) * | 2021-09-16 | 2021-12-31 | 湖南华菱湘潭钢铁有限公司 | Production method of ultra-low carbon steel wire rod for copper-clad steel wire |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5146759A (en) * | 1988-09-16 | 1992-09-15 | Toa Steel Co., Ltd. | Method for rapid direct cooling of a hot-rolled wire rod |
| JP2001335847A (en) * | 2000-05-24 | 2001-12-04 | Nkk Corp | Steel cooling method |
| JP2005270982A (en) * | 2004-03-22 | 2005-10-06 | Jfe Steel Kk | Method for controlling cooling of material to be rolled in hot rolling |
| CN1778486A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | After-roll reinforced cooling process for 82B wire rod steel strand |
| CN101665865A (en) * | 2009-10-14 | 2010-03-10 | 首钢总公司 | Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet |
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103469061A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Ultra-low carbon steel wire rod for electric conduction and production method thereof |
-
2015
- 2015-04-07 CN CN201510161148.8A patent/CN104772346B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5146759A (en) * | 1988-09-16 | 1992-09-15 | Toa Steel Co., Ltd. | Method for rapid direct cooling of a hot-rolled wire rod |
| JP2001335847A (en) * | 2000-05-24 | 2001-12-04 | Nkk Corp | Steel cooling method |
| JP2005270982A (en) * | 2004-03-22 | 2005-10-06 | Jfe Steel Kk | Method for controlling cooling of material to be rolled in hot rolling |
| CN1778486A (en) * | 2004-11-17 | 2006-05-31 | 首钢总公司 | After-roll reinforced cooling process for 82B wire rod steel strand |
| CN101665865A (en) * | 2009-10-14 | 2010-03-10 | 首钢总公司 | Structural transformation control method in continuous cooling process of ultra-low-carbon wire rod of square billet |
| CN103240271A (en) * | 2013-04-18 | 2013-08-14 | 首钢总公司 | Production method for reducing dynamic drawing aging of low-carbon steel wire rods |
| CN103469061A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | Ultra-low carbon steel wire rod for electric conduction and production method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113857254A (en) * | 2021-09-16 | 2021-12-31 | 湖南华菱湘潭钢铁有限公司 | Production method of ultra-low carbon steel wire rod for copper-clad steel wire |
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| CN104772346B (en) | 2017-01-04 |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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